Tank car top platform closure plate

ABSTRACT

According to some embodiments, a tank car comprises a tank; a top platform coupled to a top of the tank comprising a walking surface; a walkway platform extending longitudinally between an end of the tank and the top platform comprising a walking surface disposed above a line tangent to the top of the tank; and a closure plate coupled to an end of the walkway platform proximate to the top platform. The closure plate extends below the walkway platform to cover access to a space between the walking surface of the walkway platform and the top of the tank. In particular embodiments, the top platform comprises a first and second handrail assembly and a space between the handrail assemblies for accessing the walkway platform. The closure plate covers access to the space between the handrail assemblies and below the walkway platform.

BACKGROUND

Railroad tank cars transport liquid commodities, such as oil, ethanol, liquid natural gas, etc. Various safety appliances such as ladders, grab bars, platforms, handrails, etc. provide a rail operator access to the tank car. Many tank cars are equipped with a top operating platform that provides a rail operator with access to the top fittings of the tank car (e.g., various valves, gauges, inlet/outlet connections, manways, and other equipment usually mounted along a top centerline of the tank). Top platforms generally include a walking surface, such as platform grating, and hand rails for operator safety. The walking surface typically comprises a pair of running boards extending longitudinally along the tank with one running board located on each side of the top fittings. Accordingly, the running boards are generally offset to each side of the longitudinal centerline of the tank.

A rail operator generally accesses the top platform via side ladders. Some tank cars include end ladders connected to a walkway platform that extends longitudinally along the tank car and provides access between the top platform and the end ladder. The walkway platform may be located along the longitudinal centerline of the tank car and may be supported on the tank by a plurality of pads, brackets, etc. Accordingly, a walking surface of the walkway platform may be a considerable step up from a walking surface of the top platform.

SUMMARY

According to some embodiments, a tank car comprises a tank; a top platform coupled to a top of the tank comprising a walking surface; a walkway platform extending longitudinally between an end of the tank and the top platform comprising a walking surface disposed above a line tangent to the top of the tank; and a closure plate coupled to an end of the walkway platform proximate to the top platform. The closure plate extends below the walkway platform to cover a space between the walking surface of the walkway platform and the top of the tank. A bottom of the closure plate may be curved to match a curve of a lateral circumference of the tank below the walkway platform.

In particular embodiments, the top platform further comprises a first handrail assembly enclosing a portion of the top platform disposed to a first side of the walkway platform; a second handrail assembly enclosing a portion of the top platform disposed to a second side of the walkway platform; and a space between the first handrail assembly and the second handrail assembly for accessing the walkway platform. The closure plate generally covers access to the space between the walking surface of the walkway platform and the top of the tank between the first handrail assembly and the second handrail assembly. The first handrail assembly and the second handrail assembly may be coupled to the closure plate. The closure plate may comprise a first flange for coupling the first handrail assembly and a second flange for coupling the second handrail assembly. The first handrail assembly and the second handrail assembly may be bolted to the closure plate.

In particular embodiments, a longitudinal side of the first handrail assembly and the second handrail assembly are supported by one or more pads coupled to the tank. A lateral side of the first handrail assembly and the second handrail assembly are supported by the closure plate coupled to the walkway platform.

According to some embodiments, a closure plate for covering a space between a top of a tank car and a walking surface of a walkway platform coupled to the top of the tank car comprises a generally flat plate comprising a top edge and a bottom edge. The top edge is generally straight and corresponds to the generally horizontal walking surface of the walkway platform when the closure plate is coupled to an end of the walkway platform. The bottom edge extends below the walkway platform and generally covers access to a space between a walking surface of the walkway platform and the top of the tank when the closure plate is coupled to an end of the walkway platform. The bottom edge may be curved to correspond to a curve of a lateral circumference of the tank below the walkway platform.

In particular embodiments, the closure plate comprises a first flange for coupling a first handrail assembly and a second flange for coupling a second handrail assembly. The first flange and the second flange may comprise bolt holes.

According to some embodiments, a method of installing a closure plate on a tank car comprises aligning a closure plate to an end of a walkway platform of a tank car. The tank car comprises a generally cylindrical tank for transporting a commodity comprising a first end and an opposite second end. The tank car further comprises a top platform coupled to a top of the tank and disposed between the first end and the second end of the tank. The top platform comprises a walking surface. The walkway platform extends longitudinally along the top of the tank between the first or second end of the tank and the top platform and comprises a walking surface disposed above a line tangent to the top of the tank. The method further comprises coupling the closure plate to the end of the walkway platform of the tank car such that the closure plate extends below the walkway platform and generally covers access to a space between the walking surface of the walkway platform and the top of the tank. A bottom of the closure plate may be curved to correspond to a curve of a lateral circumference of the tank below the walkway platform.

In particular embodiments, the top platform further comprises a first handrail assembly enclosing a portion of the top platform disposed to a first side of the walkway platform; a second handrail assembly enclosing a portion of the top platform disposed to a second side of the walkway platform; and a space between the first handrail assembly and the second handrail assembly for accessing the walkway platform. The closure plate generally covers access to the space between the walking surface of the walkway platform and the top of the tank between the first handrail assembly and the second handrail assembly. The method may include coupling (e.g., bolting, welding, etc.) the first handrail assembly and the second handrail assembly to the closure plate. The closure plate may comprise a first flange for coupling the first handrail assembly and a second flange for coupling the second handrail assembly.

In particular embodiments, a longitudinal side of the first handrail assembly and the second handrail assembly are supported by one or more pads coupled to the tank. A lateral side of the first handrail assembly and the second handrail assembly are supported by the closure plate coupled to the walkway platform.

According to some embodiments, a method of assembling a tank car comprises mounting a generally cylindrical tank for transporting a commodity comprising a first end and an opposite second end to a pair of trucks. The method includes assembling a top platform. Assembling the top platform comprises coupling a first running board to a first handrail assembly such that the first handrail assembly at least partially encloses the first running board; coupling a second running board to a second handrail assembly such that the second handrail assembly at least partially encloses the second running board; and coupling the first handrail assembly to the second handrail assembly via at least one closure plate to form a passageway for a rail operator to pass between the first handrail assembly and the second handrail assembly. The method further comprises transporting the assembled top platform to the top of the tank; leveling the top platform on the top of the tank; and coupling the top platform to the tank. Transporting the assembled top platform to the top of the tank may comprise lifting the assembled top platform with a crane.

In particular embodiments, the method further comprises coupling a walkway platform to the top of the tank. The walkway platform extends longitudinally along the top of the tank between the first or second end of the tank and the top platform, and comprises a walking surface disposed above a line tangent to the top of the tank. The method further comprises coupling the at least one closure plate to an end of the walkway platform such that the closure plate extends below the walkway platform and generally covers access to a space between the walking surface of the walkway platform and the top of the tank. Coupling the at least one closure plate to an end of the walkway platform may comprise bolting the at least one closure plate to the end of the walkway platform. A width of the at least one closure plate may be equal to or less than a width of the walkway platform.

In particular embodiments, coupling the top platform to the tank comprises supporting a longitudinal side of the first handrail assembly and the second handrail assembly using one or more pads coupled to the tank, and supporting a lateral side of the first handrail assembly and the second handrail assembly using the closure plate coupled to the walkway platform without using pads coupled to the tank.

In particular embodiments, the first and second handrail assemblies each comprise a generally horizontal rail and a plurality of generally vertical supports. Coupling the first handrail assembly to the second handrail assembly via the at least one closure plate comprises coupling the at least one closure plate between a bottom portion of one of the plurality of generally vertical supports of the first handrail assembly and a bottom portion of one of the plurality of generally vertical supports of the second handrail assembly.

In particular embodiments, a bottom of the closure plate is curved to correspond to a curve of a lateral circumference of the tank below the walkway platform. The closure plate may comprise a first flange for coupling the first handrail assembly and a second flange for coupling the second handrail assembly. Coupling the first handrail assembly to the second handrail assembly via at least one closure plate may comprise bolting the first handrail assembly to the first flange and bolting the second handrail assembly to the second flange.

According to some embodiments, a method of assembling a tank car top platform comprises coupling a first running board to a first plurality of brackets for mounting to a tank of a tank car; coupling a first handrail assembly to the first plurality of brackets such that the first handrail assembly at least partially encloses the first running board; coupling a second running board to a second plurality of brackets for mounting to the tank of the tank car; coupling a second handrail assembly to the second plurality of brackets such that the second handrail assembly at least partially encloses the second running board; and coupling the first handrail assembly to the second handrail assembly via at least one closure plate to form a passageway for a rail operator to pass between the first handrail assembly and the second handrail assembly. The closure plate comprises a generally flat plate with a height corresponding to a height of a walkway platform above the tank of the tank car.

In particular embodiments, the first and second handrail assemblies each comprise a generally horizontal rail and a plurality of generally vertical supports. Coupling the first handrail assembly to the second handrail assembly via the at least one closure plate comprises coupling the at least one closure plate between a bottom portion of one of the plurality of generally vertical supports of the first handrail assembly and a bottom portion of one of the plurality of generally vertical supports of the second handrail assembly.

In particular embodiments, coupling the first handrail assembly to the first plurality of brackets comprises coupling a longitudinal side of the first handrail assembly to the first plurality of brackets without coupling a transverse side of the first handrail assembly to the first plurality of brackets. Coupling the second handrail assembly to the second plurality of brackets comprises coupling a longitudinal side of the second handrail assembly to the second plurality of brackets without coupling a transverse side of the second handrail assembly to the second plurality of brackets.

In particular embodiments, the closure plate comprises a first flange for coupling the first handrail assembly and a second flange for coupling the second handrail assembly. The first flange and the second flange may comprise bolt holes. Coupling the first handrail assembly to the second handrail assembly via the at least one closure plate may comprise bolting the first handrail assembly and the second handrail assembly to the closure plate. A bottom of the closure plate may curve corresponding to a curve of a lateral circumference of the tank.

According to some embodiments, a method of fabricating a closure plate comprises cutting a metal plate to a height equal to or less than a height of a walking surface of a walkway platform above a tank of a tank car; forming a first side of the metal plate into a first flange; and forming a second side of the metal plate into a second flange. A width of a middle portion of the metal plate between the first flange and the second flange is equal to or less than a width of the walkway platform of the tank car.

In particular embodiments, the method comprises drilling at least one bolt hole in the first flange and the second flange. The method may comprise cutting a bottom edge of the metal plate to correspond to a curve of a lateral circumference of the tank of the tank car.

Particular embodiments may exhibit some of the following technical advantages. Particular embodiments increase rail operator safety by reducing the tripping hazard associated with an open space under a walkway platform where the walkway platform meets a top platform. To reduce the number of parts used to mount the top platform and reduce the number of weld attachments to the tank, particular embodiments use the closure plate as an attachment point for the handrails of the top platform. In particular embodiments, instead of mounting and leveling each half of a top platform separately, closure plates tie each half of the top platform together so that the entire top platform may be mounted and leveled as a single unit, which is more efficient than mounting each half separately. Other technical advantages will be readily apparent to one skilled in the art from the following figures, description and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the embodiments and their features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram illustrating an example tank car with top platform and walkway platforms, according to some embodiments;

FIG. 2 is a schematic diagram of a top view of an example tank car with top platform and walkway platforms, according to some embodiments;

FIG. 3 is a schematic diagram of a cross section view of a walkway platform, according to some embodiments;

FIG. 4 is a schematic diagram of a perspective view of an example closure plate, according to a particular embodiment;

FIG. 5 is a schematic diagram of an end view of a walkway platform with a closure plate, according to a particular embodiment;

FIG. 6 is a schematic diagram of a side view of a closure plate coupled to a walkway platform, according to a particular embodiment;

FIG. 7 is a schematic diagram of a top view of a top platform, according to a particular embodiment;

FIG. 8 is a schematic diagram of an end view of a top platform, according to a particular embodiment;

FIG. 9 is a schematic diagram of a closure plate coupled to a top platform handrail, according to a particular embodiment;

FIG. 10 is a flow diagram illustrating an example method of installing a closure plate on a tank car, according to some embodiments;

FIG. 11 is a flow diagram illustrating an example method of assembling a tank car, according to some embodiments;

FIG. 12 is a flow diagram illustrating an example method of assembling a tank car top platform, according to some embodiments; and

FIG. 13 is a flow diagram illustrating an example method of fabricating a closure plate, according to some embodiments.

DETAILED DESCRIPTION

When leaving a tank car top platform to access an end ladder, a rail operator may step up from the top platform to a walkway platform connected to the end ladder. The walkway platform generally comprises platform grating coupled to a longitudinal centerline of the tank car via a plurality of pads and support brackets creating a generally horizontal walkway above the curved top of the tank. Supporting the walkway platform above the tank in such a manner creates an open space between the walkway platform and the top of the tank. This space may be noticeable at each end of the walkway platform, similar to a stair with an open riser. The open space may pose a tripping hazard for rail operators. For example, a rail operator may catch a toe underneath the walkway platform while trying to step from the top platform to the walkway platform.

An object of the present disclosure is to obviate at least these disadvantages and provide a closure plate, or “toe guard,” to enclose the space at the end of the walkway platform to reduce risk to rail operators. Particular embodiments include a closure plate for covering a space between a walkway platform and a tank of a tank car. Covering the space between the walkway platform and the tank may reduce the chances that a rail operator may trip (e.g., catch a foot in the open space under the walkway platform) while transitioning from a top platform of the tank car to the walkway platform.

In particular embodiments, the closure plate may provide additional benefits during the manufacture and assembly (or retrofit) of tank cars. For example, a pair of closure plates may couple two halves of a top platform together so that the entire top platform may be mounted and levelled on a tank at one time as a single unit. This provides significant time savings over mounting and leveling each half individually.

As another example, the closure plate may enable efficient mounting of top platform handrails to the tank without additional pads. In particular embodiments, the closure plate couples at least a portion of the top platform to the walkway platform instead of to the tank. These embodiments reduce the number of parts (e.g., brackets, bolts, etc.) and reduce the number of mounting pads on the tank, which also conserves time and materials during manufacturing. Thus, these embodiments may provide a more efficient manufacturing process.

The following description sets forth numerous specific details. It is understood, however, that embodiments may be practiced without these specific details. In other instances, well-known structures and techniques have not been shown in detail in order not to obscure the understanding of this description. Those of ordinary skill in the art, with the included descriptions, will be able to implement appropriate functionality without undue experimentation.

References in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to implement such feature, structure, or characteristic in connection with other embodiments, whether or not explicitly described.

Particular embodiments are described with reference to FIGS. 1-13 of the drawings, like numerals being used for like and corresponding parts of the various drawings. A railroad tank car is used throughout this disclosure as an example, but the ideas presented herein may apply to other rail cars as well.

FIG. 1 is a schematic diagram illustrating an example tank car with top platform and walkway platforms, according to some embodiments. Tank car 100 includes tank 102 coupled to trucks 104. Tank 102 comprises a generally cylindrical tank for transporting a commodity. Trucks 104 may be connected by a center sill (not illustrated). The center sill also supports tank 102.

Tank car 100 includes top fittings 106. Top fittings 106 include protective nozzles that house various valves, gauges, inlet/outlet connections, manways, and other equipment. Top fittings 106 may be coupled to tank 102 with structural pads. To provide access to top fittings 106, particular embodiments include top platform 108, walkway platforms 110, end ladders 112, and side ladders 114.

Top platform 108 provides a rail operator access to top fittings 106. In particular embodiments, top platform 108 may include various walking surfaces, such as running boards or other platforms, and various handrails for operator safety. Top platform 108 is described in more detail with respect to FIGS. 7 and 8.

An operator may access top platform 108 via side ladders 114. Each side ladder 114 may couple to a side of tank 102 and to a longitudinal side of top platform 108. A rail operator may climb side ladder 114 and pass through an opening in the handrail of top platform 108 to access top platform 108.

An operator may also access top platform 108 via end ladders 112. Each end ladder 112 may couple to an end of tank 102 or tank car 100 and walkway platform 110. A rail operator may climb end ladder 112 to access walkway platform 110 leading to top platform 108.

Walkway platform 110 extends longitudinally along a top of tank 102 from an end of tank 102 to a lateral side of top platform 108. Walkway platform 110 may be coupled to tank 102 via a plurality of brackets 116 and structural pads 118. Structural pads 118 may be welded to tank 102 and provide attachment points for brackets 116. As illustrated, walkway platform 110 is disposed above the top of tank 102 (i.e., above a line tangent to the top of the tank).

FIG. 2 is a schematic diagram of a top view of an example tank car with top platform and walkway platforms, according to some embodiments. Tank 102, top fittings 106, top platform 108, walkway platforms 110, structural pads 116, and brackets 118 are similar to those described with respect to FIG. 1.

In particular embodiments, walkway platform 110 may comprise a metal mesh platform between approximately 2 and 3 feet wide, or any width suitable for a rail operator to walk upon. Although two walkway platforms 110 are illustrated, other embodiments may include one walkway platform 110, or any suitable number greater than one.

FIG. 3 is a schematic diagram of a cross section view of a walkway platform, according to some embodiments. For example, FIG. 3 illustrates a cross section of walkway platform 110 of FIG. 2 at an end of walkway platform 110 where walkway platform 110 meets top platform 108.

In particular embodiments, bracket 116 may include a single bracket or any suitable combination of brackets to support walkway platform 110 above tank 102. Space 120 is the open space between walkway platform 110 and tank 102. In particular embodiments, walkway platform 110 may be located approximately 6 to 7 inches above tank 102 where walkway platform 110 meets top platform 108. The height of walkway platform 110 above tank 102 may vary along the length of tank 102.

If left uncovered, space 120 may pose a tripping danger to a rail operator stepping from tank 102 or top platform 108 to walkway platform 110. For example, while stepping a rail operator may accidentally insert a foot in space 120 which may get caught on, under, or between components of walkway platform 110.

In particular embodiments, a closure plate covers access to space 120 to reduce the tripping danger. An example closure plate is illustrated in FIG. 4.

FIG. 4 is a schematic diagram of a perspective view of an example closure plate, according to a particular embodiment. Closure plate 410 includes middle plate 411. Middle plate 411 is a generally flat metal plate sized to cover access to the open space between a walkway platform and a tank, such as space 120 between walkway platform 110 and tank 102 described with respect to FIG. 3. Although middle plate 411 is illustrated as generally solid, in some embodiments middle plate 411 may comprise a metal mesh or any other material (metal or non-metal) suitable to prevent a rail operator from inserting a foot in space 120.

Middle plate 411 comprises top edge 412 and bottom edge 414. In particular embodiments, top edge 412 comprises a straight edge corresponding to the flat walking surface of a walkway platform, such as walkway platform 110. In particular embodiments, top edge 412 may comprise any shape corresponding to the walking surface of a walkway platform (e.g., concave, convex, etc.).

In particular embodiments, bottom edge 414 comprises a curve corresponding to a lateral circumference of tank 102. A particular advantage is that middle plate 411 may almost completely cover access to open space 120 when bottom edge 414 corresponds to a radius of tank 102.

In other embodiments, bottom edge 414 may comprise a straight edge. A particular advantage is that a straight edge may be easier to manufacture than other configurations. Particularly when tank 102 comprises a large radius and the open spaces near the sides of middle plate 411 and tank 102 are small enough not to pose a tripping hazard to a rail operator (e.g., too small to catch an operator's foot). In other embodiments, bottom edge 414 may comprise a combination of straight edges, such as two or more sloping edges that correspond to a lateral circumference of tank 102 better than a straight edge.

In particular embodiments, bottom edge 414 may contact tank 102. In some embodiments, bottom edge 414 is proximate to tank 102, but not in contact with tank 102.

In particular embodiments, middle plate 411 may include one or more bolt holes 422. Bolt holes 422 enable middle plate 411 to be bolted to walkway platform 110. Although bolt holes 422 are illustrated at a particular location, in particular embodiments bolt holes 422 may be located at any suitable location on middle plate 411 for attaching to walkway platfoim 110 or brackets 116. Particular embodiments may not include bolt holes, and middle plate 411 may be fastened to walkway platform 110 via one or more welds or any other suitable fastener(s).

In particular embodiments, middle plate 411 may include a top lip that rests on top of walkway platform 110. For example, top edge 412 may be folded over at a 90 degree angle to rest on top of walkway platform 110. Middle plate 411 may be secured to walkway platform 110 via bolts, welds, or any other suitable fastener(s) between the top lip and walkway 110.

In particular embodiments, closure plate 410 includes flanges 416 and 418. Flanges 416 and 418 may serve as coupling points for handrails of a top platform, such as top platform 108. A particular advantage of flanges 416 and 418 is that handrails of a top platform may be secured and supported without any additional structural pads or brackets attached to a tank, such as tank 102.

For example, closure plate 410 may be attached to and supported by walkway platform 110. Accordingly, closure plate 410 is supported by structural pads 118 and brackets 116 used to support walkway platform 110. No additional structural pads or brackets are needed to support the handrails when the handrails are supported by closure plate 410. Thus, fewer parts and materials are needed to fabricate tank car 100, which conserves time and expense.

Flanges 416 and 418 may include bolt holes 420. Bolts holes 420 provide an attachment point for handrails of top platform 108. In other embodiments, handrails may be coupled to flanges 416 and 418 via one or more welds or any other suitable fastener(s). Although flanges 416 and 418 are illustrated as generally solid, in some embodiments flanges 416 and 418 may comprise a metal mesh or any material suitable to provide an attachment point and support handrails of a top platform, such as top platform 108.

Particular embodiments may not include flanges 416 and 418. In such embodiments, handrails may be coupled (e.g., bolted, welded, etc.) to middle plate 411, or coupled (e.g., bolted) to walkway platform 110 through middle plate 411 or adjacent to middle plate 411.

FIG. 5 is a schematic diagram of an end view of a walkway platform with a closure plate, according to a particular embodiment. For example, FIG. 5 illustrates the end of walkway platform 110 described with respect to FIG. 3 where access to portions of space 120 are covered by closure plate 410 described with respect to FIG. 4.

In the illustrated embodiment, closure plate 410 is bolted to walkway platform 110. Handrails 510 are bolted to flanges 416 and 418. The bottom edge of closure plate 410 is curved corresponding to a lateral circumference of tank 102 and the bottom edge of closure plate 410 is not in contact with tank 102.

A width of closure plate 410 is generally equivalent to the distance between top platform handrails 510, between which a rail operator passes through. In the illustrated example, the width of closure plate 410 is less than the width of the walkway platform 110. In other embodiments, closure plate 410 may comprise any suitable width up to or wider than the width of walkway platform 110.

In the illustrated embodiment, a bottom portion of handrail 510 is flattened to provide a flat mating surface with one of flanges 416 or 418. A flat mating surface may provide a more stable attachment than coupling a rounded handrail portion to one of flanges 416 or 418. In some embodiments, a bottom portion of handrail 510 may be flattened parallel to middle plate 411 and handrail 510 may be coupled to middle plate 411.

FIG. 6 is a schematic diagram of a side view of a closure plate coupled to a walkway platform, according to a particular embodiment. For example, FIG. 6 illustrates a side view of example of closure plate 410 coupled to walkway platform 110 illustrated in FIG. 5.

In the illustrated example, walkway platform 110 is coupled to tank 102 via structural pads 118 and brackets 116. Closure plate 410 is coupled to walkway platform 110 and handrail 510 is coupled to closure plate 410. As seen in the illustration, no additional structural pads or brackets are needed to support handrails 510 because handrails 510 are supported by closure plate 410.

FIG. 7 is a schematic diagram of a top view of a top platform, according to a particular embodiment. For example, FIG. 7 illustrates an example of top platform 108 described with reference to FIGS. 1-6.

Top platform 108 comprises running boards 712 and 714. In particular embodiments, running boards 712 and 714 may be approximately 8 feet long and approximately 8 to 10 inches wide. Running boards 712 and 714 extend along longitudinal side of top platform 108. A rail operator stands and walks on running boards 712 and 714 to access top fittings of the rail car, such as top fittings 106 of tank car 100 illustrated in FIGS. 1 and 2. Running boards 712 and 714 are coupled to tank 102 via a plurality of structural pads 718 and brackets 716.

Handrail 510 encloses top platform 108. Handrail 510 includes a generally horizontal rail and a plurality of generally vertical supports. Openings in the generally horizontal rail of handrail 510 form passageways through which a rail operator may pass to access walkway platforms 110 (e.g., openings on transverse sides of top platform 108) or side ladders 114 (e.g., openings on longitudinal sides of top platform 108). The vertical supports of handrail 510 along the longitudinal side of top platform 108 may be coupled to tank 102 via structural pads 718 and brackets 716 (i.e., the same structural pads and brackets supporting running boards 712 and 714).

Top platform 108 may be referred to as comprising a left top platform assembly 720 and a right top platform assembly 722. Left top platform assembly 720 comprises the components on the left side of top platform 108 (e.g., running board 712, the portion of handrail 510 enclosing running board 712, and structural pads 718 and brackets 716 supporting running board 712). Right top platform assembly 722 comprises the components on the right side of top platform 108 (e.g., running board 714, the portion of handrail 510 enclosing running board 714, and structural pads 718 and brackets 716 supporting running board 714).

Closure plates 410 couple handrail 510 of left top platform assembly 712 to handrail 510 of right top platform assembly 714. Without closure plates 410, top platform 108 comprises two separate assemblies (i.e., left top platform assembly 720 and right top platform assembly 722).

Mounting two top platform assemblies to tank 102 of tank car 100 is more difficult and time consuming than mounting a single top platform assembly 108. For example, without closure plates 410, a manufacturer must fit and level left top platform assembly 720 separately from right top platform assembly 722. This has disadvantages because a manufacturer tack welds each top platform assembly in place and then levels each assembly relative to each other and to tank 102. The leveling process may include removing tack welds and repeating the leveling process until both assemblies are finally level and permanently welded to the tank.

A particular advantage of closure plates 410 is that left top platform assembly 720 and right top platform assembly 722 may be coupled together on a level surface, such as a shop floor. A crane operator may lift top platform assembly 108 (i.e., left top platform assembly 720 and right top platform assembly 722 coupled together by closure plates 410) as a single unit onto tank 102. Top platform assembly 108 may be levelled as a single unit on top of tank 102 where a welder may permanently weld top platform 108 to tank 102. Setting top platform 108 as a single unit may conserve a substantial amount of time in the manufacturing of tank car 100.

FIG. 8 is a schematic diagram of an end view of a top platform, according to a particular embodiment. For example, FIG. 8 illustrates an end view to top platform 108 described with respect to FIG. 7.

Running boards 712 and 714 are coupled to brackets 116 and structural pads 118. A handrail, such as handrail 510, encloses each running board.

Each handrail comprises horizontal rails 812 and vertical supports 814. Vertical supports 814 a along the longitudinal sides of top platform 108 are supported by brackets 116 and structural pads 118. Vertical supports 814 b along the transverse sides of top platform 108 are coupled to closure plates 410. In particular embodiments, horizontal rail 812 may include a bend where horizontal rail 812 transitions to vertical support 814 (e.g., vertical support 814 b). Vertical supports 814 may also comprise separate supports coupled to horizontal rail 812 (e.g., vertical support 814 a).

Closure plate 410 couples a bottom portion of vertical supports 814 b to each other. Without coupling the handrails via closure plates 410, the opening in the handrail to access walkway platform 110 results in two separate top platform assemblies, as described above with respect to FIG. 7. By coupling the two top platform assemblies together, closure plate 410 enables a manufacturer to set and weld top platform 108 as a single unit, which is considerably faster than setting two units and leveling them with respect to each other and tank 102.

FIG. 9 is a schematic diagram of a closure plate coupled to a top platform handrail, according to a particular embodiment. For example, FIG. 9 illustrates a close up view of the connection between closure plate 410 and vertical supports 814 b illustrated in FIG. 8.

In the illustrated embodiment, closure plate 410 couples portions of handrail 510 to each other. A first handrail assembly (e.g., handrail 510 comprising a portion of left top platform assembly 720) may be coupled to a second handrail assembly (e.g., handrail 510 comprising a portion of right top platform assembly 722) via closure plate 410 to form top platform 108. In the illustrated embodiment, flanges 416 and 418 are coupled to a bottom portion of handrail 510.

FIG. 10 is a flow diagram illustrating an example method of installing a closure plate on a tank car, according to some embodiments. In particular embodiments, one or more steps of FIG. 10 may be performed to install a closure plate, such as closure plate 410, on a tank car, such as tank car 100, described with respect to FIGS. 1-9.

The method begins at step 1012, where a closure plate is aligned to an end of a walkway platform of a tank car. For example, closure plate 410 is aligned to an end of walkway platform 110 of tank car 100. The end of walkway platform 110 is proximate to top platform 108. In particular embodiments, top platform 108 may include handrails 510 with a space between handrails 510 for a rail operator to access walkway platform 110 from top platform 108. Closure plate 410 may be aligned between handrails 510 in the space where the rail operator accesses walkway platform 110.

At step 1014, the closure plate is coupled to the end of the walkway platform. For examples, closure plate 410 may be coupled (e.g., bolted, welded, etc.) to the end of walkway platform 110 of tank car 100. In particular embodiments, closure plate 410 extends below walkway platform 110 and generally covers access to a space between the walking surface of walkway platform 110 and the top of tank 102. A bottom edge of closure plate 410 may be curved to match a curve of a lateral circumference of tank 102 below walkway platform 110.

At optional step 1016, a first handrail assembly and a second handrail assembly are coupled to the closure plate. For example, closure plate 410 may be coupled (e.g., bolted, welded, etc.) to a handrail assembly of left top platform assembly 720 and a handrail assembly of right top platform assembly 722. In particular embodiments, closure plate 410 may include flanges, such as flanges 416 and 418, for coupling to the first handrail assembly and the second handrail assembly.

Modifications, additions, or omissions may be made to method 1000. Additionally, one or more steps in method 1000 of FIG. 10 may be performed in parallel or in any suitable order. For example, optional step 1016 may be performed before steps 1012 and/or 1014.

FIG. 11 is a flow diagram illustrating an example method of assembling a tank car, according to some embodiments. In particular embodiments, one or more steps of FIG. 11 may be performed to assemble a tank car, such as tank car 100, described with respect to FIGS. 1-9.

The method begins at step 1112, where a generally cylindrical tank for transporting a commodity comprising a first end and an opposite second end is mounted to a pair of trucks. For example, tank 102 may be mounted to pair of trucks 104.

At step 1114, a portion of a top platform is assembled by coupling a first running board to a first handrail assembly such that the first handrail assembly at least partially encloses the first running board. For example, handrail 510 may be coupled to running board 712 such that handrail 510 partially encloses running board 712 (e.g., left top platform assembly 720).

At step 1116, a portion of a top platform is assembled by coupling a second running board to a second handrail assembly such that the second handrail assembly at least partially encloses the second running board. For example, handrail 510 may be coupled (e.g., bolted, welded, etc.) to running board 714 such that handrail 510 partially encloses running board 714 (e.g., right top platform assembly 722).

At step 1118, the top platform is assembled by coupling the first handrail assembly to the second handrail assembly via at least one closure plate to form a passageway for a rail operator to pass between the first handrail assembly and the second handrail assembly. For example, handrail 510 of left top platform assembly 720 may be coupled (e.g., bolted, welded, etc.) to a first side of closure plate 410 and handrail 510 of right top platform assembly 722 may be coupled to a second side of closure plate 410, as illustrated in FIGS. 8 and 9 for example, resulting in the assembled top platform assembly illustrated in FIG. 7, for example.

Without coupling the first handrail assembly to the second handrail assembly, the opening in the handrails for access to walkway platform 110 divide the top platform into two halves (e.g., left top platform assembly 720 and right top platform assembly 722). Mounting two top platform assemblies to a tank of tank car is more difficult and time consuming than mounting a single top platform assembly 108. For example, a manufacturer must fit and level each top platform assembly separately. This has disadvantages because a manufacturer tack welds each top platform assembly in place and then levels each assembly relative to each other and to the tank. The leveling process may include removing tack welds and repeating the leveling process until both assemblies are level and permanently welded to the tank.

A particular advantage of step 1118 is that each top platform assembly may be coupled together on a level surface, such as a shop floor. Step 1118 enables the following steps to be performed on an assembled top platform, which is more efficient

At step 1120, the assembled top platform is transported to the top of the tank. For example, a crane operator may transport top platform 108 as a single unit from a shop floor to the top of tank 102.

At step 1122, the assembled top platform is levelled on the top of the tank. For example, top platform 108 may be levelled as a single unit on the top of tank 102.

At step 1124, the top platform is coupled to the tank. For example, top platform 108 may be coupled to tank 102 (e.g., via brackets 116 and structural pads 118 along a longitudinal side of top platform 108). A particular advantage of steps 1122 and 1124 is that top platform 118 may be coupled to tank 102 without repeated tack welding of two halves of the platform to level them with respect to each other and the tank. Because the top platform is assembled on a level surface, such as a shop floor, the two halves of the top platform are level with respect to each other before being coupled to the tank. Coupling the top platform to the tank is simplified because the top platform need only be levelled with respect to the tank and welded in place.

At optional step 1126, a walkway platform is coupled to the top of the tank. For example, walkway platform 110 may be coupled to tank 102. In particular embodiments, walkway platform 110 may extend from top platform 108 to an end of tank 102 to provide a rail operator access to end ladder 112.

At optional step 1128, the closure plate is coupled to an end of the walkway platform. For example, closure plate 410 may be coupled (e.g., bolted, welded, etc.) to an end of walkway platform 110 proximate to top platform 108. In particular embodiments, a walking surface of walkway platform 110 may be higher than a walking surface of top platform 118. In such embodiments, closure plate 410 may extend below walkway platform 110 and generally cover a space, such as space 120, between the walking surface of walkway platform 110 and the top of tank 102.

Modifications, additions, or omissions may be made to method 1100. Additionally, one or more steps in method 1100 of FIG. 11 may be performed in parallel or in any suitable order.

FIG. 12 is a flow diagram illustrating an example method of assembling a tank car top platform, according to some embodiments. In particular embodiments, one or more steps of FIG. 12 may be performed to assemble a tank car top platform, such as top platform 108 of tank car 100, described with respect to FIGS. 1-9.

The method begins at step 1212, where a first running board is coupled to a first plurality of brackets for mounting to a tank of a tank car. For example, running board 712 may be coupled to a plurality of brackets 716 for mounting to tank 102 of tank car 100. At step 1214, a first handrail assembly is coupled to the first plurality of brackets such that the first handrail at least partially encloses the first running board. For example, handrail 510 may be mounted to the plurality of brackets 716 to partially enclose running board 712, such as handrail 510 of left top platform assembly 720 illustrated in FIG. 7. In particular embodiments, a longitudinal side of handrail 510 may be coupled to the plurality of brackets 716 while a transverse side of handrail 510 is not.

At step 1216, a second running board is coupled to a second plurality of brackets for mounting to the tank of the tank car. For example, running board 714 may be coupled to a plurality of brackets 716 for mounting to tank 102 of tank car 100.

At step 1218, a second handrail assembly is coupled to the second plurality of brackets such that the second handrail at least partially encloses the second running board. For example, handrail 510 may be mounted to the plurality of brackets 716 to partially enclose running board 714, such as handrail 510 of right top platform assembly 722 illustrated in FIG. 7. In particular embodiments, a longitudinal side of handrail 510 may be coupled to the plurality of brackets 716 while a transverse side of handrail 510 is not.

At step 1220, the first handrail assembly is coupled to the second handrail assembly via at least one closure plate to form a passageway for a rail operator to pass between the first handrail assembly and the second handrail assembly. For example, handrail 510 of left top platform assembly 720 may be coupled to handrail 510 of right top platform assembly 722 via closure plate 410, such as illustrated in FIGS. 7-9. In particular embodiments, closure plate 410 may be bolted, welded, or fastened in any suitable way to handrails 510. In particular embodiments, closure plate 410 comprises a generally flat plate with a height corresponding to a height of walkway platform 110 above tank 102 of tank car 100. Modifications, additions, or omissions may be made to method 1200. Additionally, one or more steps in method 1200 of FIG. 12 may be performed in parallel or in any suitable order.

FIG. 13 is a flow diagram illustrating an example method of fabricating a closure plate, according to some embodiments. In particular embodiments, one or more steps of FIG. 13 may be performed to fabricate a closure plate, such as closure plate 410 described with respect to FIGS. 1-9.

The method begins a step 1312, where a metal plate is cut to a height equal to or less than a height of a walking surface of a walkway platform above a tank of a tank car. For example, a metal plate, such as a steel plate, may be cut to a height generally equal to the height of a walking surface of walkway platform 110 above tank 102 of tank car 100. In particular embodiments, the metal plate may comprise a solid metal plate, a metal mesh, or any suitable material.

At step 1314, a first side of the metal plate is formed into a first flange. For example, a first side of the metal plate may be formed into flange 416 illustrated in FIG. 4. In particular embodiments, forming the flange may comprise bending a side of the metal plate in a press, brake, or other suitable bending machine.

At step 1316, a second side of the metal plate is formed into a second flange. For example, a second side of the metal plate may be formed into flange 418 illustrated in FIG. 4.

At step 1318, a second side of the metal plate is formed into a second flange. For example, a second side of the metal plate may be formed into flange 418 illustrated in FIG. 4. In particular embodiments, a width of the middle portion of the metal plate between the first and second flange, such as middle portion 411 illustrated in FIG. 4, is equal to or less than a width of the walkway platform of the tank car. In particular embodiments, middle portion 411 is approximately 2 feet wide.

At optional step 1320, at least one bolt hole is drilled in the first flange and the second flange. For example, bolt holes 420 may be drilled in flanges 416 and 418 of closure plate 410.

At optional step 1322, a bottom edge of the metal plate is cut to match a curve of a lateral circumference of the tank of the tank car. For example, bottom edge 414 of closure plate 410 may be cut to match a lateral circumference of tank 102.

The cutting steps of method 1300 may be performed with any suitable tool for cutting metal, such as a saw, a grinder, a torch, etc.

Modifications, additions, or omissions may be made to method 1300. Additionally, one or more steps in method 1300 of FIG. 13 may be performed in parallel or in any suitable order.

Some embodiments of the disclosure may provide one or more technical advantages. As an example, particular embodiments increase rail operator safety by reducing the tripping hazard associated with an open space under a walkway platform where the walkway platform meets a top platform. To reduce the number of parts used to mount the top platform and reduce the number of weld attachments to the tank, particular embodiments use the closure plate as an attachment point for the handrails of the top platform. In particular embodiments, instead of mounting and leveling each half of a top platform separately, closure plates tie each half of the top platform together so that the entire top platform may be mounted and leveled as a single unit, which is more efficient than mounting each half separately. Some embodiments may benefit from some, none, or all of these advantages. Other technical advantages may be readily ascertained by one of ordinary skill in the art.

Modifications, additions, or omissions may be made to the systems and apparatuses disclosed herein without departing from the scope of the invention. The components of the systems and apparatuses may be integrated or separated.

Modifications, additions, or omissions may be made to the methods disclosed herein without departing from the scope of the invention. The methods may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order.

Although this disclosure has been described in terms of certain embodiments, alterations and peiinutations of the embodiments will be apparent to those skilled in the art. Accordingly, the above description of the embodiments does not constrain this disclosure. Other changes, substitutions, and alterations are possible without departing from the spirit and scope of this disclosure, as defined by the claims below. 

1. A tank car comprising: a generally cylindrical tank for transporting a commodity comprising a first end and an opposite second end; a top platform coupled to a top of the tank and disposed between the first end and the second end of the tank, the top platform comprising a walking surface; a walkway platform extending longitudinally along the top of the tank between the first or second end of the tank and the top platform, the walkway platform comprising a walking surface disposed above a line tangent to the top of the tank; and a closure plate coupled to an end of the walkway platform proximate to the top platform, the closure plate extending below the walkway platform and generally covering a space between the walking surface of the walkway platform and the top of the tank.
 2. The tank car of claim 1, wherein a bottom of the closure plate is curved to correspond to a curve of a lateral circumference of the tank below the walkway platform.
 3. The tank car of claim 1, wherein: the top platform further comprises: a first handrail assembly enclosing a portion of the top platform disposed to a first side of the walkway platform; a second handrail assembly enclosing a portion of the top platform disposed to a second side of the walkway platform; and a space between the first handrail assembly and the second handrail assembly for accessing the walkway platform; and the closure plate generally covers access to the space between the walking surface of the walkway platform and the top of the tank between the first handrail assembly and the second handrail assembly.
 4. The tank car of claim 3, wherein the first handrail assembly and the second handrail assembly are coupled to the closure plate.
 5. The tank car of claim 4, wherein the closure plate comprises a first flange for coupling the closure plate to the first handrail assembly and a second flange for coupling the closure plate to the second handrail assembly.
 6. The tank car of claim 4, wherein the first handrail assembly and the second handrail assembly are bolted to the closure plate.
 7. The tank car of claim 4, wherein the first handrail assembly and the second handrail assembly each comprises: a longitudinal side supported by one or more pads coupled to the tank; and a lateral side supported by the closure plate coupled to the walkway platform.
 8. The tank car of claim 1, wherein the closure plate is bolted to the end of the walkway platform proximate to the top platform.
 9. A closure plate for covering access to a space between a top of a tank car and a generally horizontal walking surface of a walkway platform coupled to the top of the tank car, the closure plate comprising: a generally flat plate comprising a top edge and a bottom edge, wherein: the top edge is generally straight and corresponds to the generally horizontal walking surface of the walkway platform when the closure plate is coupled to an end of the walkway platform; and the bottom edge extends below the walkway platform and generally covers access to a space between the generally horizontal walking surface of the walkway platform and the top of the tank when the closure plate is coupled to an end of the walkway platform.
 10. The closure plate of claim 9, wherein the bottom edge is curved to correspond to a curve of a lateral circumference of the tank below the walkway platform.
 11. The closure plate of claim 9, further comprising a first flange for coupling the closure plate to a first handrail assembly and a second flange for coupling the closure plate to a second handrail assembly.
 12. The closure plate of claim 11, wherein the first flange and the second flange comprise bolt holes.
 13. A method of installing a closure plate on a tank car, the method comprising: aligning a closure plate to an end of a walkway platform of a tank car, wherein the tank car comprises: a generally cylindrical tank for transporting a commodity comprising a first end and an opposite second end; a top platform coupled to a top of the tank and disposed between the first end and the second end of the tank, the top platform comprising a walking surface; and the walkway platform extends longitudinally along the top of the tank between the first or second end of the tank and the top platform and comprises a walking surface disposed above the line tangent to the top of the tank; and coupling the closure plate to the end of the walkway platform of the tank car such that the closure plate extends below the walkway platform and generally covers access to a space between the walking surface of the walkway platform and the top of the tank.
 14. The method of claim 13, wherein a bottom of the closure plate is curved to correspond to a curve of a lateral circumference of the tank below the walkway platform.
 15. The method of claim 13, wherein: the top platform further comprises: a first handrail assembly enclosing a portion of the top platform disposed to a first side of the walkway platform; a second handrail assembly enclosing a portion of the top platform disposed to a second side of the walkway platform; and a space between the first handrail assembly and the second handrail assembly for accessing the walkway platform; and the closure plate generally covers access to the space between the walking surface of the walkway platform and the top of the tank between the first handrail assembly and the second handrail assembly.
 16. The method of claim 15, further comprising coupling the first handrail assembly and the second handrail assembly to the closure plate.
 17. The method of claim 16, wherein the closure plate comprises a first flange for coupling the closure plate to the first handrail assembly and a second flange for coupling the closure plate to the second handrail assembly.
 18. The method of claim 16, comprising bolting the first handrail assembly and the second handrail assembly to the closure plate.
 19. The method of claim 16, wherein the first handrail assembly and the second handrail assembly each comprises: a longitudinal side supported by one or more pads coupled to the tank; and a lateral side supported by the closure plate coupled to the walkway platform.
 20. The method of claim 13, comprising bolting the closure plate to the end of the walkway platform proximate to the top platform. 